/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.cep.nfa;

import org.apache.flink.cep.Event;
import org.apache.flink.cep.pattern.GroupPattern;
import org.apache.flink.cep.pattern.Pattern;
import org.apache.flink.cep.pattern.conditions.SimpleCondition;
import org.apache.flink.cep.utils.NFATestHarness;
import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
import org.apache.flink.util.TestLogger;

import org.apache.flink.shaded.guava18.com.google.common.collect.Lists;

import org.junit.Test;

import java.util.ArrayList;
import java.util.List;

import static org.apache.flink.cep.utils.NFATestUtilities.comparePatterns;
import static org.apache.flink.cep.utils.NFATestUtilities.feedNFA;
import static org.apache.flink.cep.utils.NFAUtils.compile;
import static org.junit.Assert.assertEquals;

/**
 * IT tests covering {@link GroupPattern}.
 */
@SuppressWarnings("unchecked")
public class GroupITCase extends TestLogger {

	@Test
	public void testGroupFollowedByTimes() throws Exception {
		List<StreamRecord<Event>> inputEvents = new ArrayList<>();

		Event c = new Event(40, "c", 1.0);
		Event a1 = new Event(41, "a", 2.0);
		Event b1 = new Event(42, "b", 3.0);
		Event a2 = new Event(43, "a", 4.0);
		Event b2 = new Event(44, "b", 5.0);
		Event d = new Event(45, "d", 6.0);

		inputEvents.add(new StreamRecord<>(c, 1));
		inputEvents.add(new StreamRecord<>(a1, 2));
		inputEvents.add(new StreamRecord<>(b1, 3));
		inputEvents.add(new StreamRecord<>(a2, 4));
		inputEvents.add(new StreamRecord<>(b2, 5));
		inputEvents.add(new StreamRecord<>(d, 6));

		// c (a b){2} d
		Pattern<Event, ?> pattern = Pattern.<Event>begin("start").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("c");
			}
		}).followedBy(Pattern.<Event>begin("middle1").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("a");
			}
		}).followedBy("middle2").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("b");
			}
		})).times(2).followedBy("end").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("d");
			}
		});

		NFA<Event> nfa = compile(pattern, false);

		final List<List<Event>> resultingPatterns = feedNFA(inputEvents, nfa);

		comparePatterns(resultingPatterns, Lists.<List<Event>>newArrayList(
			Lists.newArrayList(c, a1, b1, a2, b2, d)
		));
	}

	@Test
	public void testGroupFollowedByOptional() throws Exception {
		List<StreamRecord<Event>> inputEvents = new ArrayList<>();

		Event c = new Event(40, "c", 1.0);
		Event a1 = new Event(41, "a", 2.0);
		Event a2 = new Event(42, "a", 2.0);
		Event b = new Event(43, "b", 3.0);
		Event d = new Event(44, "d", 4.0);

		inputEvents.add(new StreamRecord<>(c, 1));
		inputEvents.add(new StreamRecord<>(a1, 2));
		inputEvents.add(new StreamRecord<>(a2, 3));
		inputEvents.add(new StreamRecord<>(b, 4));
		inputEvents.add(new StreamRecord<>(d, 5));

		// c (a b)? d
		Pattern<Event, ?> pattern = Pattern.<Event>begin("start").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("c");
			}
		}).followedBy(Pattern.<Event>begin("middle1").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("a");
			}
		}).followedBy("middle2").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("b");
			}
		})).optional().followedBy("end").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("d");
			}
		});

		NFA<Event> nfa = compile(pattern, false);

		final List<List<Event>> resultingPatterns = feedNFA(inputEvents, nfa);

		comparePatterns(resultingPatterns, Lists.<List<Event>>newArrayList(
			Lists.newArrayList(c, d),
			Lists.newArrayList(c, a1, b, d)
		));
	}

	@Test
	public void testFollowedByGroupTimesOptional() throws Exception {
		List<StreamRecord<Event>> inputEvents = new ArrayList<>();

		Event c = new Event(40, "c", 1.0);
		Event a = new Event(41, "a", 2.0);
		Event d = new Event(45, "d", 3.0);

		inputEvents.add(new StreamRecord<>(c, 1));
		inputEvents.add(new StreamRecord<>(a, 2));
		inputEvents.add(new StreamRecord<>(d, 3));

		// c (a b){2}? d
		Pattern<Event, ?> pattern = Pattern.<Event>begin("start").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("c");
			}
		}).followedBy(Pattern.<Event>begin("middle1").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("a");
			}
		}).followedBy("middle2").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("b");
			}
		})).times(2).optional().followedBy("end").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("d");
			}
		});

		NFA<Event> nfa = compile(pattern, false);

		final List<List<Event>> resultingPatterns = feedNFA(inputEvents, nfa);

		comparePatterns(resultingPatterns, Lists.<List<Event>>newArrayList(
			Lists.newArrayList(c, d)
		));
	}

	@Test
	public void testGroupFollowedByOneOrMore() throws Exception {
		List<StreamRecord<Event>> inputEvents = new ArrayList<>();

		Event c = new Event(40, "c", 1.0);
		Event a1 = new Event(41, "a", 2.0);
		Event b1 = new Event(42, "b", 3.0);
		Event a2 = new Event(43, "a", 4.0);
		Event b2 = new Event(44, "b", 5.0);
		Event d = new Event(45, "d", 6.0);

		inputEvents.add(new StreamRecord<>(c, 1));
		inputEvents.add(new StreamRecord<>(a1, 2));
		inputEvents.add(new StreamRecord<>(b1, 3));
		inputEvents.add(new StreamRecord<>(a2, 4));
		inputEvents.add(new StreamRecord<>(b2, 5));
		inputEvents.add(new StreamRecord<>(d, 6));

		// c (a b)+ d
		Pattern<Event, ?> pattern = Pattern.<Event>begin("start").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("c");
			}
		}).followedBy(Pattern.<Event>begin("middle1").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("a");
			}
		}).followedBy("middle2").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("b");
			}
		})).oneOrMore().followedBy("end").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("d");
			}
		});

		NFA<Event> nfa = compile(pattern, false);

		final List<List<Event>> resultingPatterns = feedNFA(inputEvents, nfa);

		comparePatterns(resultingPatterns, Lists.<List<Event>>newArrayList(
			Lists.newArrayList(c, a1, b1, d),
			Lists.newArrayList(c, a1, b1, a2, b2, d)
		));
	}

	@Test
	public void testGroupFollowedByZeroOrMore() throws Exception {
		List<StreamRecord<Event>> inputEvents = new ArrayList<>();

		Event c = new Event(40, "c", 1.0);
		Event a1 = new Event(41, "a", 2.0);
		Event b1 = new Event(42, "b", 3.0);
		Event a2 = new Event(43, "a", 4.0);
		Event b2 = new Event(44, "b", 5.0);
		Event d = new Event(45, "d", 6.0);

		inputEvents.add(new StreamRecord<>(c, 1));
		inputEvents.add(new StreamRecord<>(a1, 2));
		inputEvents.add(new StreamRecord<>(b1, 3));
		inputEvents.add(new StreamRecord<>(a2, 4));
		inputEvents.add(new StreamRecord<>(b2, 5));
		inputEvents.add(new StreamRecord<>(d, 6));

		// c (a b)* d
		Pattern<Event, ?> pattern = Pattern.<Event>begin("start").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("c");
			}
		}).followedBy(Pattern.<Event>begin("middle1").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("a");
			}
		}).followedBy("middle2").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("b");
			}
		})).oneOrMore().optional().followedBy("end").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("d");
			}
		});

		NFA<Event> nfa = compile(pattern, false);

		final List<List<Event>> resultingPatterns = feedNFA(inputEvents, nfa);

		comparePatterns(resultingPatterns, Lists.<List<Event>>newArrayList(
			Lists.newArrayList(c, d),
			Lists.newArrayList(c, a1, b1, d),
			Lists.newArrayList(c, a1, b1, a2, b2, d)
		));
	}

	@Test
	public void testGroupFollowedByAnyTimesCombinations() throws Exception {
		List<StreamRecord<Event>> inputEvents = new ArrayList<>();

		Event c = new Event(40, "c", 1.0);
		Event a1 = new Event(41, "a", 2.0);
		Event b1 = new Event(42, "b", 3.0);
		Event a2 = new Event(43, "a", 4.0);
		Event b2 = new Event(44, "b", 5.0);
		Event a3 = new Event(45, "a", 4.0);
		Event b3 = new Event(46, "b", 5.0);
		Event d = new Event(47, "d", 6.0);

		inputEvents.add(new StreamRecord<>(c, 1));
		inputEvents.add(new StreamRecord<>(a1, 2));
		inputEvents.add(new StreamRecord<>(b1, 3));
		inputEvents.add(new StreamRecord<>(a2, 4));
		inputEvents.add(new StreamRecord<>(b2, 5));
		inputEvents.add(new StreamRecord<>(a3, 6));
		inputEvents.add(new StreamRecord<>(b3, 7));
		inputEvents.add(new StreamRecord<>(d, 8));

		// c any (a b){2} d
		Pattern<Event, ?> pattern = Pattern.<Event>begin("start").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("c");
			}
		}).followedByAny(Pattern.<Event>begin("middle1").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("a");
			}
		}).followedBy("middle2").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("b");
			}
		})).times(2).allowCombinations().followedBy("end").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("d");
			}
		});

		NFA<Event> nfa = compile(pattern, false);

		final List<List<Event>> resultingPatterns = feedNFA(inputEvents, nfa);

		comparePatterns(resultingPatterns, Lists.<List<Event>>newArrayList(
			Lists.newArrayList(c, a1, b1, a2, b2, d),
			Lists.newArrayList(c, a1, b1, a3, b3, d),
			Lists.newArrayList(c, a2, b2, a3, b3, d)
		));
	}

	@Test
	public void testGroupFollowedByAnyTimesOptional() throws Exception {
		List<StreamRecord<Event>> inputEvents = new ArrayList<>();

		Event c = new Event(40, "c", 1.0);
		Event a1 = new Event(41, "a", 2.0);
		Event b1 = new Event(42, "b", 3.0);
		Event a2 = new Event(43, "a", 4.0);
		Event b2 = new Event(44, "b", 5.0);
		Event a3 = new Event(45, "a", 4.0);
		Event b3 = new Event(46, "b", 5.0);
		Event d = new Event(47, "d", 6.0);

		inputEvents.add(new StreamRecord<>(c, 1));
		inputEvents.add(new StreamRecord<>(a1, 2));
		inputEvents.add(new StreamRecord<>(b1, 3));
		inputEvents.add(new StreamRecord<>(a2, 4));
		inputEvents.add(new StreamRecord<>(b2, 5));
		inputEvents.add(new StreamRecord<>(a3, 6));
		inputEvents.add(new StreamRecord<>(b3, 7));
		inputEvents.add(new StreamRecord<>(d, 8));

		// c any (a b){2}? d
		Pattern<Event, ?> pattern = Pattern.<Event>begin("start").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("c");
			}
		}).followedByAny(Pattern.<Event>begin("middle1").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("a");
			}
		}).followedBy("middle2").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("b");
			}
		})).times(2).optional().followedBy("end").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("d");
			}
		});

		NFA<Event> nfa = compile(pattern, false);

		final List<List<Event>> resultingPatterns = feedNFA(inputEvents, nfa);

		comparePatterns(resultingPatterns, Lists.<List<Event>>newArrayList(
			Lists.newArrayList(c, d),
			Lists.newArrayList(c, a1, b1, a2, b2, d),
			Lists.newArrayList(c, a2, b2, a3, b3, d)
		));
	}

	@Test
	public void testGroupFollowedByAnyOneOrMore() throws Exception {
		List<StreamRecord<Event>> inputEvents = new ArrayList<>();

		Event c = new Event(40, "c", 1.0);
		Event a1 = new Event(41, "a", 2.0);
		Event b1 = new Event(42, "b", 3.0);
		Event a2 = new Event(43, "a", 4.0);
		Event b2 = new Event(44, "b", 5.0);
		Event a3 = new Event(45, "a", 4.0);
		Event b3 = new Event(46, "b", 5.0);
		Event d = new Event(47, "d", 6.0);

		inputEvents.add(new StreamRecord<>(c, 1));
		inputEvents.add(new StreamRecord<>(a1, 2));
		inputEvents.add(new StreamRecord<>(b1, 3));
		inputEvents.add(new StreamRecord<>(a2, 4));
		inputEvents.add(new StreamRecord<>(b2, 5));
		inputEvents.add(new StreamRecord<>(a3, 6));
		inputEvents.add(new StreamRecord<>(b3, 7));
		inputEvents.add(new StreamRecord<>(d, 8));

		// c any (a b){1,} d
		Pattern<Event, ?> pattern = Pattern.<Event>begin("start").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("c");
			}
		}).followedByAny(Pattern.<Event>begin("middle1").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("a");
			}
		}).followedBy("middle2").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("b");
			}
		})).oneOrMore().followedBy("end").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("d");
			}
		});

		NFA<Event> nfa = compile(pattern, false);

		final List<List<Event>> resultingPatterns = feedNFA(inputEvents, nfa);

		comparePatterns(resultingPatterns, Lists.<List<Event>>newArrayList(
			Lists.newArrayList(c, a1, b1, d),
			Lists.newArrayList(c, a2, b2, d),
			Lists.newArrayList(c, a3, b3, d),
			Lists.newArrayList(c, a1, b1, a2, b2, d),
			Lists.newArrayList(c, a2, b2, a3, b3, d),
			Lists.newArrayList(c, a1, b1, a2, b2, a3, b3, d)
		));
	}

	@Test
	public void testGroupNextZeroOrMore() throws Exception {
		List<StreamRecord<Event>> inputEvents = new ArrayList<>();

		Event c = new Event(40, "c", 1.0);
		Event a1 = new Event(41, "a", 2.0);
		Event b1 = new Event(42, "b", 3.0);
		Event a2 = new Event(43, "a", 3.0);
		Event b2 = new Event(44, "b", 3.0);
		Event a3 = new Event(45, "a", 4.0);
		Event b3 = new Event(46, "b", 3.0);
		Event d = new Event(47, "d", 1.0);

		inputEvents.add(new StreamRecord<>(c, 1L));
		inputEvents.add(new StreamRecord<>(a1, 3L));
		inputEvents.add(new StreamRecord<>(b1, 4L));
		inputEvents.add(new StreamRecord<>(a2, 5L));
		inputEvents.add(new StreamRecord<>(b2, 6L));
		inputEvents.add(new StreamRecord<>(a3, 7L));
		inputEvents.add(new StreamRecord<>(b3, 8L));
		inputEvents.add(new StreamRecord<>(d, 9L));

		// c next (a b)* d
		Pattern<Event, ?> pattern = Pattern.<Event>begin("start").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 6215754202506583964L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("c");
			}
		}).next(Pattern.<Event>begin("middle1").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("a");
			}
		}).followedBy("middle2").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("b");
			}
		})).oneOrMore().optional().consecutive().followedBy("end").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 7056763917392056548L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("d");
			}
		});

		NFA<Event> nfa = compile(pattern, false);

		final List<List<Event>> resultingPatterns = feedNFA(inputEvents, nfa);

		comparePatterns(resultingPatterns, Lists.<List<Event>>newArrayList(
			Lists.newArrayList(c, d),
			Lists.newArrayList(c, a1, b1, d),
			Lists.newArrayList(c, a1, b1, a2, b2, d),
			Lists.newArrayList(c, a1, b1, a2, b2, a3, b3, d)
		));
	}

	@Test
	public void testGroupNotFollowedBy() throws Exception {
		List<StreamRecord<Event>> inputEvents = new ArrayList<>();

		Event c = new Event(40, "c", 1.0);
		Event a1 = new Event(41, "a", 2.0);
		Event b1 = new Event(42, "b", 3.0);
		Event d = new Event(43, "d", 3.0);
		Event a2 = new Event(44, "a", 4.0);
		Event b2 = new Event(45, "b", 5.0);
		Event e = new Event(46, "e", 6.0);

		inputEvents.add(new StreamRecord<>(c, 1));
		inputEvents.add(new StreamRecord<>(a1, 2));
		inputEvents.add(new StreamRecord<>(b1, 3));
		inputEvents.add(new StreamRecord<>(d, 4));
		inputEvents.add(new StreamRecord<>(a2, 5));
		inputEvents.add(new StreamRecord<>(b2, 6));
		inputEvents.add(new StreamRecord<>(e, 7));

		// c (a b) ^d e
		Pattern<Event, ?> pattern = Pattern.<Event>begin("start").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("c");
			}
		}).followedByAny(Pattern.<Event>begin("middle1").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("a");
			}
		}).followedBy("middle2").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("b");
			}
		})).notFollowedBy("notPattern").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("d");
			}
		}).followedBy("end").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("e");
			}
		});

		NFA<Event> nfa = compile(pattern, false);

		final List<List<Event>> resultingPatterns = feedNFA(inputEvents, nfa);

		comparePatterns(resultingPatterns, Lists.<List<Event>>newArrayList(
			Lists.newArrayList(c, a2, b2, e)
		));
	}

	@Test
	public void testGroupNotNext() throws Exception {
		List<StreamRecord<Event>> inputEvents = new ArrayList<>();

		Event c = new Event(40, "c", 1.0);
		Event a1 = new Event(41, "a", 2.0);
		Event b1 = new Event(42, "b", 3.0);
		Event d = new Event(43, "d", 3.0);
		Event a2 = new Event(44, "a", 4.0);
		Event b2 = new Event(45, "b", 5.0);
		Event e = new Event(46, "e", 6.0);

		inputEvents.add(new StreamRecord<>(c, 1));
		inputEvents.add(new StreamRecord<>(a1, 2));
		inputEvents.add(new StreamRecord<>(b1, 3));
		inputEvents.add(new StreamRecord<>(d, 4));
		inputEvents.add(new StreamRecord<>(a2, 5));
		inputEvents.add(new StreamRecord<>(b2, 6));
		inputEvents.add(new StreamRecord<>(e, 7));

		// c (a b) next ^d e
		Pattern<Event, ?> pattern = Pattern.<Event>begin("start").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("c");
			}
		}).followedByAny(Pattern.<Event>begin("middle1").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("a");
			}
		}).followedBy("middle2").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("b");
			}
		})).notNext("notPattern").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("d");
			}
		}).followedBy("end").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("e");
			}
		});

		NFA<Event> nfa = compile(pattern, false);

		final List<List<Event>> resultingPatterns = feedNFA(inputEvents, nfa);

		comparePatterns(resultingPatterns, Lists.<List<Event>>newArrayList(
			Lists.newArrayList(c, a2, b2, e)
		));
	}

	@Test
	public void testGroupNest() throws Exception {
		List<StreamRecord<Event>> inputEvents = new ArrayList<>();

		Event d = new Event(40, "d", 1.0);
		Event a1 = new Event(41, "a", 2.0);
		Event b1 = new Event(42, "b", 3.0);
		Event c1 = new Event(43, "c", 4.0);
		Event b2 = new Event(44, "b", 5.0);
		Event c2 = new Event(45, "c", 4.0);
		Event e = new Event(46, "e", 6.0);

		inputEvents.add(new StreamRecord<>(d, 1));
		inputEvents.add(new StreamRecord<>(a1, 2));
		inputEvents.add(new StreamRecord<>(b1, 3));
		inputEvents.add(new StreamRecord<>(c1, 4));
		inputEvents.add(new StreamRecord<>(b2, 5));
		inputEvents.add(new StreamRecord<>(c2, 6));
		inputEvents.add(new StreamRecord<>(e, 7));

		// d (a (b c)*)? e
		Pattern<Event, ?> pattern = Pattern.<Event>begin("start").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("d");
			}
		}).followedBy(Pattern.<Event>begin("middle1").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("a");
			}
		}).followedBy(Pattern.<Event>begin("middle2").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("b");
			}
		}).followedBy("middle3").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("c");
			}
		})).oneOrMore().optional()).optional().followedBy("end").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("e");
			}
		});

		NFA<Event> nfa = compile(pattern, false);

		final List<List<Event>> resultingPatterns = feedNFA(inputEvents, nfa);

		comparePatterns(resultingPatterns, Lists.<List<Event>>newArrayList(
			Lists.newArrayList(d, e),
			Lists.newArrayList(d, a1, e),
			Lists.newArrayList(d, a1, b1, c1, e),
			Lists.newArrayList(d, a1, b1, c1, b2, c2, e)
		));
	}

	@Test
	public void testGroupNestTimes() throws Exception {
		List<StreamRecord<Event>> inputEvents = new ArrayList<>();

		Event d = new Event(40, "d", 1.0);
		Event a1 = new Event(41, "a", 2.0);
		Event b1 = new Event(42, "b", 3.0);
		Event c1 = new Event(43, "c", 4.0);
		Event b2 = new Event(44, "b", 5.0);
		Event c2 = new Event(45, "c", 4.0);
		Event b3 = new Event(46, "b", 5.0);
		Event c3 = new Event(47, "c", 4.0);
		Event a2 = new Event(48, "a", 2.0);
		Event b4 = new Event(49, "b", 3.0);
		Event c4 = new Event(50, "c", 4.0);
		Event b5 = new Event(51, "b", 5.0);
		Event c5 = new Event(52, "c", 4.0);
		Event b6 = new Event(53, "b", 5.0);
		Event c6 = new Event(54, "c", 4.0);
		Event e = new Event(55, "e", 6.0);

		inputEvents.add(new StreamRecord<>(d, 1));
		inputEvents.add(new StreamRecord<>(a1, 2));
		inputEvents.add(new StreamRecord<>(b1, 3));
		inputEvents.add(new StreamRecord<>(c1, 4));
		inputEvents.add(new StreamRecord<>(b2, 5));
		inputEvents.add(new StreamRecord<>(c2, 6));
		inputEvents.add(new StreamRecord<>(b3, 7));
		inputEvents.add(new StreamRecord<>(c3, 8));
		inputEvents.add(new StreamRecord<>(a2, 9));
		inputEvents.add(new StreamRecord<>(b4, 10));
		inputEvents.add(new StreamRecord<>(c4, 11));
		inputEvents.add(new StreamRecord<>(b5, 12));
		inputEvents.add(new StreamRecord<>(c5, 13));
		inputEvents.add(new StreamRecord<>(b6, 14));
		inputEvents.add(new StreamRecord<>(c6, 15));
		inputEvents.add(new StreamRecord<>(e, 16));

		// d any (a (b c){3}){0, 2} e
		Pattern<Event, ?> pattern = Pattern.<Event>begin("start").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("d");
			}
		}).followedByAny(Pattern.<Event>begin("middle1").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("a");
			}
		}).followedBy(Pattern.<Event>begin("middle2").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("b");
			}
		}).followedBy("middle3").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("c");
			}
		})).times(3)).times(0, 2).followedBy("end").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("e");
			}
		});

		NFA<Event> nfa = compile(pattern, false);

		final List<List<Event>> resultingPatterns = feedNFA(inputEvents, nfa);

		comparePatterns(resultingPatterns, Lists.<List<Event>>newArrayList(
			Lists.newArrayList(d, e),
			Lists.newArrayList(d, a1, b1, c1, b2, c2, b3, c3, e),
			Lists.newArrayList(d, a2, b4, c4, b5, c5, b6, c6, e),
			Lists.newArrayList(d, a1, b1, c1, b2, c2, b3, c3, a2, b4, c4, b5, c5, b6, c6, e)
		));
	}

	@Test
	public void testGroupNestTimesConsecutive() throws Exception {
		List<StreamRecord<Event>> inputEvents = new ArrayList<>();

		Event d = new Event(40, "d", 1.0);
		Event a1 = new Event(41, "a", 2.0);
		Event b1 = new Event(42, "b", 3.0);
		Event c1 = new Event(43, "c", 4.0);
		Event b2 = new Event(44, "b", 5.0);
		Event c2 = new Event(45, "c", 4.0);
		Event b3 = new Event(46, "b", 5.0);
		Event c3 = new Event(47, "c", 4.0);
		Event a2 = new Event(48, "a", 2.0);
		Event b4 = new Event(49, "b", 3.0);
		Event c4 = new Event(50, "c", 4.0);
		Event b5 = new Event(51, "b", 5.0);
		Event c5 = new Event(52, "c", 4.0);
		Event b6 = new Event(53, "b", 5.0);
		Event c6 = new Event(54, "c", 4.0);
		Event e = new Event(55, "e", 6.0);

		inputEvents.add(new StreamRecord<>(d, 1));
		inputEvents.add(new StreamRecord<>(a1, 2));
		inputEvents.add(new StreamRecord<>(b1, 3));
		inputEvents.add(new StreamRecord<>(c1, 4));
		inputEvents.add(new StreamRecord<>(b2, 5));
		inputEvents.add(new StreamRecord<>(c2, 6));
		inputEvents.add(new StreamRecord<>(b3, 7));
		inputEvents.add(new StreamRecord<>(c3, 8));
		inputEvents.add(new StreamRecord<>(a2, 9));
		inputEvents.add(new StreamRecord<>(b4, 10));
		inputEvents.add(new StreamRecord<>(c4, 11));
		inputEvents.add(new StreamRecord<>(new Event(0, "breaking", 99.0), 12));
		inputEvents.add(new StreamRecord<>(b5, 13));
		inputEvents.add(new StreamRecord<>(c5, 14));
		inputEvents.add(new StreamRecord<>(b6, 15));
		inputEvents.add(new StreamRecord<>(c6, 16));
		inputEvents.add(new StreamRecord<>(e, 17));

		// d any (a (b c){3}){0, 2} e
		Pattern<Event, ?> pattern = Pattern.<Event>begin("start").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("d");
			}
		}).followedByAny(Pattern.<Event>begin("middle1").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("a");
			}
		}).followedBy(Pattern.<Event>begin("middle2").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("b");
			}
		}).followedBy("middle3").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("c");
			}
		})).times(3).consecutive()).times(0, 2).consecutive().followedBy("end").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("e");
			}
		});

		NFA<Event> nfa = compile(pattern, false);

		final List<List<Event>> resultingPatterns = feedNFA(inputEvents, nfa);

		comparePatterns(resultingPatterns, Lists.<List<Event>>newArrayList(
			Lists.newArrayList(d, e),
			Lists.newArrayList(d, a1, b1, c1, b2, c2, b3, c3, e)
		));
	}

	@Test
	public void testGroupBegin() throws Exception {
		List<StreamRecord<Event>> inputEvents = new ArrayList<>();

		Event a1 = new Event(41, "a", 2.0);
		Event b1 = new Event(42, "b", 3.0);
		Event a2 = new Event(43, "a", 4.0);
		Event b2 = new Event(44, "b", 5.0);
		Event d = new Event(45, "d", 6.0);

		inputEvents.add(new StreamRecord<>(a1, 1));
		inputEvents.add(new StreamRecord<>(b1, 2));
		inputEvents.add(new StreamRecord<>(a2, 3));
		inputEvents.add(new StreamRecord<>(b2, 4));
		inputEvents.add(new StreamRecord<>(d, 5));

		// (a b){1, 2} d
		Pattern<Event, ?> pattern = Pattern.begin(Pattern.<Event>begin("middle1").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("a");
			}
		}).followedBy("middle2").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("b");
			}
		})).times(1, 2).followedBy("end").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("d");
			}
		});

		NFA<Event> nfa = compile(pattern, false);

		final List<List<Event>> resultingPatterns = feedNFA(inputEvents, nfa);

		comparePatterns(resultingPatterns, Lists.<List<Event>>newArrayList(
			Lists.newArrayList(a1, b1, d),
			Lists.newArrayList(a2, b2, d),
			Lists.newArrayList(a1, b1, a2, b2, d)
		));
	}

	@Test
	public void testGroupFollowedByOneOrMoreWithUntilCondition() throws Exception {
		List<StreamRecord<Event>> inputEvents = new ArrayList<>();

		Event c = new Event(40, "c", 1.0);
		Event a1 = new Event(41, "a", 2.0);
		Event b1 = new Event(42, "b", 3.0);
		Event a2 = new Event(43, "a", 4.0);
		Event b2 = new Event(44, "b", 5.0);
		Event d = new Event(45, "d", 6.0);

		inputEvents.add(new StreamRecord<>(c, 1));
		inputEvents.add(new StreamRecord<>(a1, 2));
		inputEvents.add(new StreamRecord<>(b1, 3));
		inputEvents.add(new StreamRecord<>(a2, 4));
		inputEvents.add(new StreamRecord<>(b2, 5));
		inputEvents.add(new StreamRecord<>(d, 6));

		// c (a b)+ d
		Pattern<Event, ?> pattern = Pattern.<Event>begin("start").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("c");
			}
		}).followedBy(Pattern.<Event>begin("middle1").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("a");
			}
		}).followedBy("middle2").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("b");
			}
		})).oneOrMore().until(new SimpleCondition<Event>() {
			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("d");
			}
		}).followedBy("end").where(new SimpleCondition<Event>() {
			private static final long serialVersionUID = 5726188262756267490L;

			@Override
			public boolean filter(Event value) throws Exception {
				return value.getName().equals("d");
			}
		});

		NFA<Event> nfa = compile(pattern, false);

		NFAState nfaState = nfa.createInitialNFAState();

		NFATestHarness nfaTestHarness = NFATestHarness.forNFA(nfa).withNFAState(nfaState).build();
		final List<List<Event>> resultingPatterns = nfaTestHarness.feedRecords(inputEvents);

		comparePatterns(resultingPatterns, Lists.<List<Event>>newArrayList(
			Lists.newArrayList(c, a1, b1, d),
			Lists.newArrayList(c, a1, b1, a2, b2, d)
		));

		assertEquals(1, nfaState.getPartialMatches().size());
		assertEquals("start", nfaState.getPartialMatches().peek().getCurrentStateName());
	}

}
